# What would distinguish the mass spectrum of 2 2 dimethylpropane from those of pentane and 2 Methylbutane?

## What would distinguish the mass spectrum of 2 2 dimethylpropane from those of pentane and 2 Methylbutane?

The peak at m/z = 57 will be more intense for 2,2-dimethylpropane than for 2-methylbutane or pentane. The peak at m/z = 57 is due to loss of a methyl radical: loss of a methyl radical from 2, 2-dimethylpropane forms a tertiary carbocation.

How many signals does 2 2 Dimethylbutane have?

The hydrogen atoms (protons) of 2,2-dimethylbutane occupy 3 different chemical environments so that the low resolution NMR spectra should show 3 peaks of different H-1 NMR chemical shifts (diagram above for 2,2-dimethylbutane).

What distinguishes the mass spectrum of 2 2 dimethylpropane from the mass spectra of pentane and isopentane check all that apply?

The peak at m/z = 57 will be more intense for 2, 2-dimethylpropane than for isopentane or pentane. The peak at m/z = 43 will be most intense for isopentane because such a peak is due to loss of an ethyl radical, which forms a secondary carbocation.

### What is the molar mass of 2 2 dimethylpropane?

72.15 g/molNeopentane / Molar mass

What does the M+ peak mean?

The M+ peak is usually the highest intensity peak in the cluster of peaks at highest m/z.

What is mass spectrometry for dummies?

Mass spectrometry (also called mass spec) provides valuable information about the structure of molecular compounds. This molecular ion peak tells you the molecular weight of the molecule, because losing an electron doesn’t really change the weight of the molecule (it’s like a tractor trailer losing a lug nut).

## What percentage of 2 2 dimethylbutane is recovered from water?

The recoveries of 2,2-dimethylbutane from water at 30 and 60 °C were 52 and 84%, respectively. Recoveries of 2,2-dimethylbutane with the two series of tubes (all Tenax-TA or 3 different kinds) were 33.7, 38.5, and 26.1%, and 33.0, 64.4, and 2.6% for tubes 1, 2, and 3, respectively.

What is the concentration of dimethylbutane in the atmosphere?

The arithmetic and geometric means were 47.9 and 43.9 ppbC, respectively, for the atmospheric 2,2-dimethylbutane content at urban locations in NW England (6). 2,2-dimethylbutane was detected at a mean concentration of 1.1 ug/cu m around the Los Angeles, CA area during a smog event on September 8-9, 1993 (7).

What is the vapor pressure of 2/2-dimethylbutane?

If released to air, a vapor pressure of 319 mm Hg at 25 °C indicates 2,2-dimethylbutane will exist solely as a vapor in the atmosphere.

### What is the KOC value of 2 2 dimethylbutane?

The Koc of 2,2-dimethylbutane is estimated as 2100 (SRC), using a log Kow of 3.82 (1) and a regression-derived equation (2). According to a classification scheme (3), this estimated Koc value suggests that 2,2-dimethylbutane is expected to have slight mobility in soil.

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